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From "Alejandro Abdelnur (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2316) webhdfs: a complete FileSystem implementation for accessing HDFS over HTTP
Date Fri, 21 Oct 2011 22:18:32 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2316?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13133129#comment-13133129

Alejandro Abdelnur commented on HDFS-2316:

Thanks Sanjay. A couple of follow up issues in the current API:

* Permission masks are currently octal in webhdfs and symbolic in hoop. IMO, it should make
sense to support both.

* File ranges, webhdfs uses HTTP 'content-ranges' header, hoop uses 2 query string params
offset= & len=. In webhdfs, except for this type of requests, for all other request the
URL itself fully describes what is being requested. Because webhdfs uses  the HTTP 'content-ranges'
header a URL is not sufficient to specify the desired range. With Hoop approach a URL self-contains
the desired range, making it easier to use from libraries and scripts.

> webhdfs: a complete FileSystem implementation for accessing HDFS over HTTP
> --------------------------------------------------------------------------
>                 Key: HDFS-2316
>                 URL: https://issues.apache.org/jira/browse/HDFS-2316
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: WebHdfsAPI20111020.pdf
> We current have hftp for accessing HDFS over HTTP.  However, hftp is a read-only FileSystem
and does not provide "write" accesses.
> In HDFS-2284, we propose to have webhdfs for providing a complete FileSystem implementation
for accessing HDFS over HTTP.  The is the umbrella JIRA for the tasks.

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